[vsnet-grb-info 26450] GRB 201001A: TSHAO optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Oct 2 23:40:32 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28550
SUBJECT: GRB 201001A: TSHAO optical upper limit
DATE: 20/10/02 14:39:28 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
S. Belkin (IKI), I. Reva (FAPHI), A. Pozanenko (IKI) report on behalf
of GRB-IKI-FuN:
We observed the field of GRB 201001A (Simpson et al., GCN 28539) with
Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting
on Oct. 01 (UT) 22:56:08.
No optical source is detected within enhanced Swift-XRT position (Evans
et al., GCN 28540). This corresponds to the absence of the source in
earlier optical observations (Simpson et al., GCN 28539; Hosokawa et
al., GCN 28548; Fu et al., GCN 28549). Preliminary photometry of the
field is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3 sigma)
(mid, days) (s)
2020-10-01 22:56:08 0.54732 R 22*50 n/d n/d 20.3
The photometry is based on nearby USNO-B1.0 star.
USNO-B1.0_id R2
0877-0204059 15.98
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